<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  </head>
  <style>
      body{
          color: pink;;
          border: 1px solid #bbffaa;
      }
  </style>
  <body>
    <div id="app">
      <div :style ="{border:borderStyle,width:widthStyle,height:heightStyle}"></div>
      <div :style ='objStyles'></div>
      <div :style ='[objStyles,overrideStyles]'></div>
      <button v-on:click = 'handle'>切换</button>
    </div>
    <script type="text/javascript">
      const vm = new Vue({
        el: "#app",
        data: {
            borderStyle: '1px solid blue',
            widthStyle: '100px',
            heightStyle: '200px',
            objStyles:{
                border:'1px solid green',
                width:'200px ',
                height:'100px',
            },
            overrideStyles:{
                border:'5px solid orange',
                backgroundColor:'blue',
            }
        },
        methods: {
          handle: function () {
           this.heightStyle = '100px';
           this.objStyles.width = '100px';
          },
        },
      });
    </script>
  </body>
</html>
